I'm currently using a D5000, its a pretty good little camera although its not great at high iso which has got me wanting some fast glass.
I use my 35 1.8 a lot because I love the images it produces and its amazing in low light so I'm hoping the 17-55 will give me similar results with a bit more flexibility.
I hope to upgrade in the near future to either the D7000 or the D300s replacement.
I also want to invest in some quality glass because as we all know 2.8 glass will always produce great images no matter what body its attached too.